chicory button vs common chicory

chicory button

noun
  • A plant of the species Cichorium intybus 

common chicory

noun
  • Cichorium intybus, a somewhat woody perennial herbaceous plant of the dandelion family, many varieties of which are cultivated for salad leaves. 

How often have the words chicory button and common chicory occurred in a corpus of books? (source: Google Ngram Viewer )